1. Frame : ASTM/KS Material 2. Flange : Channel/Anglel 3. Blade : Double-Layer 4. Seal : C-276/A-59 5 .Tightness : 99.9% 6. Actuator : Pneumatic/Electric 7. Application : FGD, DeNOx, Boiler Other Industial Plants. 8. Leak Zero Damper (with sealing air) 9. Compared to Tandem Damper, it has higher pressure drop and larger installation space 10. Pallaral Operating, Isolation Function